<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>折线图</title>
<style>
#mycav{
  background-color: #eee;
} 

</style>
</head>
<body>

<canvas id="mycav" width="700" height="500"></canvas>


<script src="./zhexiantu.js"></script>
</body>
</html>